17note: reference respective welding parameters and joint preparations on pages 32 - 34.

oK flux 10.72bonded flux

oK flux 10.72 is a neutral, bonded aluminate-basic flux. It is primarily used for for applications with toughness requirements down to -50C in high dilution joints. It also provides excellent slag removal in narrow V-joints. It is recommended for joining structural steels, fine grained steels and creep-resistant steels. It has proved to be the worlds most popular flux for wind tower productions. OK Flux 10.72 features extremely high current carrying capacity and is intended for single or multiwire procedures using DC and AC power. It can be used for single-layer and multi-layer welding of unlimited plate thickness.

code and specification data:AWS A5.17; F6P8-EM12K AWS A5.23; F8A4-ENi1K-Ni1 AWS A5.17; F7A8-EM12K AWS A5.23; F9A4-ENi4-Ni4 AWS A5.17; F7P5-EM14K

basicity index: 1.9 chemical composition:SiO2 + TiO2 20 CaO + MgO 30Al2 + MnO 25 Fluorides 25

flux consumption(lb. Flux / lb. Wire)

Voltage DC+

26 0.69

30 0.88

34 1.3

38 1.66

typical mechanical properties

WireWeld

Condition

Yield StrengthTensile

Strength% Elong

in 2 CVN Temp.

AWS Classksi (MPa) ksi (MPa) (51 mm) ft.-lbs. (J) @ F (C)

Spoolarc 81 As Welded 62 425 75 515 30 35 50 -80 -62 F7A8-EM12K

Spoolarc 81 Stress Relieved 1 hr. @ 1,150F 59 405 74 510 32 35 50 -80 -62 F6P8-EM12K

Spoolarc 81 Stress Relieved 8 hrs. @ 1,150F 58 400 74 510 34 120 163 -50 -46 F6P8-EM12K

Spoolarc 75 As Welded 76 550 89 655 28 110 149 -40 -40 F8A4-ENi1K-Ni1

Spoolarc ENi4 As Welded 85 585 96 680 26 115 156 -40 -40 F9A4-ENi4-Ni4

Spoolarc 71 Stress Relieved 1 hr. @ 1,150F 72 495 88 605 30 67 91 -50 -46 F7P5-EM14K

Spoolarc 71 Stress Relieved 8 hrs. @ 1,150F 71 490 87 600 30 65 88 -50 -46 F7P5-EM14K

typical undiluted weld metal analysis (%)

Wire C Mn Si P S Cr Ni Mo Cu

Spoolarc 81 0.06 1.60 0.30 0.013 0.009

Spoolarc 75 0.06 1.80 0.50 0.013 0.009 0.90

Spoolarc ENi4 0.07 1.60 0.20 0.012 0.006 1.80 0.15 0.15

Spoolarc 71 0.08 1.90 0.50 0.018 0.009

% mn pick-up from flux

% si pick-up from flux

% Manganese in wire

1

0.8

0.6

0.4

1.01 1.81

% Silicon in wire

0.3

0.2

0.1

0 0.038 0.187

450 amps

750 amps

450 amps

750 amps0.2

0

OK flux 10.72 is well established in wind tower fabrication, as well as the manufacturing of pressure vessels, penstocks and in general fabrication.